Carbon-Normalized Sorption Coefficient The sorption coefficient, Kp can be calculated from the carbon normalized sorption coefficient, Koc. The Koc is defined as: Koc = Sorption Coefficient, Kp Fraction Organic Carbon, foc To determine the soil organic carbon content at a site, samples are taken back to the laboratory. There, they are first acidified to dissolve and remove the inorganic carbon (carbonates). Weighed samples of the soil are then burned in an oxygen atmosphere and the CO2 produced is

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